Fig. 20. A. After the Stevens' hook is inserted into the incision created by the Westcott scissors, the hook is moved anteriorly to pass over the upper pole of the insertion of the rectus muscle. If the hook cannot pass anterior to the rectus muscle, the insertion may have been split by the Jameson hook. Fibers of the rectus muscle tendon that are not on the hook will remain at the insertion. It is important to include these fibers to achieve a reproducible recession effect. B. Residual tendon fibers of a detached lateral rectus. These are demonstrated with the Steven's muscle hook.